From: "Philippe Mathieu-Daudé" <philmd@linaro.org>
To: Peter Maydell <peter.maydell@linaro.org>,
qemu-arm@nongnu.org, qemu-devel@nongnu.org
Subject: Re: [PATCH 7/7] target/arm: Implement FEAT_HBC
Date: Mon, 11 Sep 2023 17:01:12 +0200 [thread overview]
Message-ID: <bb402f78-9c2f-e337-933e-a024852a0994@linaro.org> (raw)
In-Reply-To: <20230911135340.1139553-8-peter.maydell@linaro.org>
On 11/9/23 15:53, Peter Maydell wrote:
> FEAT_HBC (Hinted conditional branches) provides a new instruction
> BC.cond, which behaves exactly like the existing B.cond except
> that it provides a hint to the branch predictor about the
> likely behaviour of the branch.
>
> Since QEMU does not implement branch prediction, we can treat
> this identically to B.cond.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
> docs/system/arm/emulation.rst | 1 +
> target/arm/cpu.h | 5 +++++
> target/arm/tcg/a64.decode | 3 ++-
> linux-user/elfload.c | 1 +
> target/arm/tcg/cpu64.c | 4 ++++
> target/arm/tcg/translate-a64.c | 4 ++++
> 6 files changed, 17 insertions(+), 1 deletion(-)
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
next prev parent reply other threads:[~2023-09-11 15:06 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-11 13:53 [PATCH 0/7] target/arm: hwcaps updates, FEAT_HBC Peter Maydell
2023-09-11 13:53 ` [PATCH 1/7] target/arm: Add ID_AA64ISAR2_EL1 Peter Maydell
2023-09-11 13:53 ` [PATCH 2/7] linux-user/elfload.c: Correct SME feature names reported in cpuinfo Peter Maydell
2023-09-11 14:51 ` Philippe Mathieu-Daudé
2023-09-11 13:53 ` [PATCH 3/7] linux-user/elfload.c: Add missing arm and arm64 hwcap values Peter Maydell
2023-09-11 14:59 ` Philippe Mathieu-Daudé
2023-09-11 15:04 ` Peter Maydell
2023-09-11 13:53 ` [PATCH 4/7] linux-user/elfload.c: Report previously missing arm32 hwcaps Peter Maydell
2023-09-11 13:53 ` [PATCH 5/7] target/arm: Update AArch64 ID register field definitions Peter Maydell
2023-09-11 14:36 ` Peter Maydell
2023-09-11 13:53 ` [PATCH 6/7] target/arm: Update user-mode ID reg mask values Peter Maydell
2023-09-21 15:03 ` Peter Maydell
2023-09-11 13:53 ` [PATCH 7/7] target/arm: Implement FEAT_HBC Peter Maydell
2023-09-11 15:01 ` Philippe Mathieu-Daudé [this message]
2023-09-12 0:44 ` [PATCH 0/7] target/arm: hwcaps updates, FEAT_HBC Richard Henderson
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